Morph Cut skipping frame, outputting artefact instead

[Corniger]

Hey there,

I've been applying morph cuts in side a nested sequence. Most of them work fine, but there are 2 of them a relatively short time after another. There's always a "gap" in between them that looks like that:

There's a vignette on a background layer, so that's correct, bit there's no such edge or vertical line, just a person.
I've tried reapplying the morph cut, alzering it length, but it just outputs the artefact in the altered length.

Latest version of PP, Win 10, 128 GB RAM, Quadro M5000, Dual Xeons, M2 SSDs only

N.b.: there are no gaps or problems in the preview. This only occurs after output via Media Encoder - exporting directly, it doesn't happen!

[Peru Bob]

Try turning off Hardware encoding in the Video tab of the export settings.

[Corniger]

@Peru Bob  Thank you very much - I'll try that with the next project if it occurs again.

For now, I just wonder (I I don't expect you to answer that) how - and why - Media Encoder renders differently than PP does, which works smoothly without having to disable anything.  Or what causes the faulty output, and why there's no error message or any indication. Recently, I output a 7 hour video. I imagine it would be a nightmare having to go through every single cut to check if... well, if you chose the right Adobe product to render you Adobe product video sequence with.